Guys: sex question (not for the young-uns)?

would a guy like it if i gave him oral immediately after sex? ill be honest i watch a hella amount of porn and a lot of times after the girl "climaxes" she takes it right out and starts giving him head! would a guy actually like that, or is it unrealistic? i want to give it a try: kinky- possibly, slutty-maybe, pornstar-ish- definitely, desired- im not sure. would a guy want that much stimulation right after climaxing or has the porn industry mislead me? explanations would be appreciated!